×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

17-4 PH

17-4 PH

17-4 PH

(OP)
We had a 15+" diameter bar of condition A, ASTM A705, 17-4 PH double aged to condition H1150.  The hardness came out around 37 HRC.  NACE requires the hardness to be 33 HRC max.

1. Any ideas as to what went wrong?
2. Would there be any bebefit to repeating the double aging process?

RE: 17-4 PH

If you go back to the original data from Armco on 17/4 Ph S/S you will find that they give you a range of hardness for each condition, though this seems high for an 1150, 1150 treatment..
If  the H1150,H1150 was done correctly you will not get the hardness down by redoing it.
Let me do some checking as you might use the overaging treatment to lower the hardness.

That is rather a large bar how did you take the hardness?

RE: 17-4 PH

What hold time did you use?
You will need to hold at 1125 D.F. for at least 13.5 hours then set the temp. up to 115 D.F. for 4 hours at heat. Repeat for Double 115O NACE condition.

RE: 17-4 PH

I'm still looking for my literature.
What is the actual physical dimension of your part?

RE: 17-4 PH

(OP)
We've decided to go ahead and re-treat the bar in an attempt to draw back the hardness.  Thanks all for your input.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources